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祖母绿是绿柱石的一种,它的化学成份是Be_3Al_2[Si_6O_18],呈六方晶体,其单晶体呈柱状,它的矿物集合体呈粒状结构或晶簇状结构。绿柱石呈深浅不同的绿色,看上去有玻璃光泽。绿柱石解理不完全,硬度在7.5—8度之间,比重为2.63克/立方厘米—2.91克/立方厘米。祖母绿是含铬的绿柱石,呈鲜绿色。绿柱石中含铁,呈透明蓝色的叫做“海蓝宝石”;绿柱石中含铯,呈玫瑰色的称为“玫瑰绿柱石”。绿柱石产于花岗伟晶
Emerald is a kind of beryl. Its chemical composition is Be_3Al_2 [Si_6O_18], which is hexagonal. Its single crystal is columnar, and its mineral aggregates are granular or cluster-like. Beryl in different shades of green, looks shiny glass. Beryl incomplete cleavage, the hardness of 7.5-8 degrees, the proportion of 2.63 g / cm -2.91 g / cm. Emerald is a chromic beryl that is bright green. The beryl in the beryl is called “aquamarine” in a clear blue color; cesium in the beryl is rose, called “rose beryl”. Beryl produced in granite Peking